#app {
    font-family: "Microsoft YaHei", "微软雅黑", sans-serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-align: center;
}

.hidden {
    display: none;
}

.form-container {
    display: flex;
    justify-content: center; /* 水平居中 */
    align-items: center; /* 垂直居中（可选） */
}